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449f4a6673
* Update project.pbxproj files to say Flutter rather than Chromium Also, the templates now have an empty organization so that we don't cause people to give their apps a Flutter copyright. * Update the copyright notice checker to require a standard notice on all files * Update copyrights on Dart files. (This was a mechanical commit.) * Fix weird license headers on Dart files that deviate from our conventions; relicense Shrine. Some were already marked "The Flutter Authors", not clear why. Their dates have been normalized. Some were missing the blank line after the license. Some were randomly different in trivial ways for no apparent reason (e.g. missing the trailing period). * Clean up the copyrights in non-Dart files. (Manual edits.) Also, make sure templates don't have copyrights. * Fix some more ORGANIZATIONNAMEs
51 lines
2.0 KiB
Dart
51 lines
2.0 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// This example shows how to show the text 'Hello, world.' using using the raw
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// interface to the engine.
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import 'dart:ui' as ui;
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void beginFrame(Duration timeStamp) {
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final double devicePixelRatio = ui.window.devicePixelRatio;
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final ui.Size logicalSize = ui.window.physicalSize / devicePixelRatio;
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final ui.ParagraphBuilder paragraphBuilder = ui.ParagraphBuilder(
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ui.ParagraphStyle(textDirection: ui.TextDirection.ltr),
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)
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..addText('Hello, world.');
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final ui.Paragraph paragraph = paragraphBuilder.build()
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..layout(ui.ParagraphConstraints(width: logicalSize.width));
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final ui.Rect physicalBounds = ui.Offset.zero & (logicalSize * devicePixelRatio);
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final ui.PictureRecorder recorder = ui.PictureRecorder();
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final ui.Canvas canvas = ui.Canvas(recorder, physicalBounds);
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canvas.scale(devicePixelRatio, devicePixelRatio);
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canvas.drawParagraph(paragraph, ui.Offset(
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(logicalSize.width - paragraph.maxIntrinsicWidth) / 2.0,
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(logicalSize.height - paragraph.height) / 2.0,
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));
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final ui.Picture picture = recorder.endRecording();
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final ui.SceneBuilder sceneBuilder = ui.SceneBuilder()
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// TODO(abarth): We should be able to add a picture without pushing a
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// container layer first.
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..pushClipRect(physicalBounds)
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..addPicture(ui.Offset.zero, picture)
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..pop();
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ui.window.render(sceneBuilder.build());
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}
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// This function is the primary entry point to your application. The engine
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// calls main() as soon as it has loaded your code.
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void main() {
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// The engine calls onBeginFrame whenever it wants us to produce a frame.
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ui.window.onBeginFrame = beginFrame;
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// Here we kick off the whole process by asking the engine to schedule a new
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// frame. The engine will eventually call onBeginFrame when it is time for us
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// to actually produce the frame.
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ui.window.scheduleFrame();
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}
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